function s1_hello(){
echo "hi,world!"
}
s1_hello

function s2_tell_who_i_am(){
echo "Enter you name:"
read user_name
echo "user name is $user_name"
}
s2_tell_who_i_am

function s3_which_distro_do_i_use(){
NAME= "Beta Linux"
echo $NAME
}
s3_which_distro_do_i_use

function s4_view_my_cpu_arch(){
uname -m
}
s4_view_my_cpu_arch

function s5_show_first_scsi_disk_size(){
lsbk -l |\grep disk |\grep '^sda' |awk '{print $4}'
}
s5_show_first_scsi_disk_size

functions6_show_mian_memory_size_in_megabytes(){
free -m|grep "Mem:" |awk '{print $2}'
}
s6_show_main_memory_size_in_megabytes

